No freezing and hopefully no other bugs

First of all, you can now switch between one and two player without the game freezing up. That was a silly thing on my end where the time freeze from pausing was not reverted.

Second of all, there was really weird and rare bug where the ball would basically lose its x velocity. I've tried a ton of things, but honestly I can't even reliably recreate it. I thought it was kicked until the AI caused it a couple days ago and then I realized it was a problem. I moved the boundaries of the play area closer in so hopefully the ball will bounce before it gets pinched between a paddle and the wall.

One other dumb bug was that the ball could fly off the screen but that's gone now.

Thanks for reading and playing!